From cb9b88c669396e3e5f957fe909ff901b51321013 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 6 Dec 2019 15:57:18 -0800 Subject: KVM: x86/mmu: Refactor handling of cache consistency with TDP Pre-calculate the max level for a TDP page with respect to MTRR cache consistency in preparation of replacing force_pt_level with max_level, and eventually combining the bulk of nonpaging_page_fault() and tdp_page_fault() into a common helper. No functional change intended. Signed-off-by: Sean Christopherson Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/mmu.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) (limited to 'arch/x86/kvm/mmu') diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index b3633067143e..defe94ecd0a4 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4271,16 +4271,6 @@ int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code, } EXPORT_SYMBOL_GPL(kvm_handle_page_fault); -static bool -check_hugepage_cache_consistency(struct kvm_vcpu *vcpu, gfn_t gfn, int level) -{ - int page_num = KVM_PAGES_PER_HPAGE(level); - - gfn &= ~(page_num - 1); - - return kvm_mtrr_check_gfn_range_consistency(vcpu, gfn, page_num); -} - static int tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, bool prefault) { @@ -4294,6 +4284,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, bool map_writable; bool lpage_disallowed = (error_code & PFERR_FETCH_MASK) && is_nx_huge_page_enabled(); + int max_level; MMU_WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)); @@ -4304,14 +4295,21 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, if (r) return r; - force_pt_level = - lpage_disallowed || - !check_hugepage_cache_consistency(vcpu, gfn, PT_DIRECTORY_LEVEL); + for (max_level = PT_MAX_HUGEPAGE_LEVEL; + max_level > PT_PAGE_TABLE_LEVEL; + max_level--) { + int page_num = KVM_PAGES_PER_HPAGE(max_level); + gfn_t base = gfn & ~(page_num - 1); + + if (kvm_mtrr_check_gfn_range_consistency(vcpu, base, page_num)) + break; + } + + force_pt_level = lpage_disallowed || max_level == PT_PAGE_TABLE_LEVEL; level = mapping_level(vcpu, gfn, &force_pt_level); if (likely(!force_pt_level)) { - if (level > PT_DIRECTORY_LEVEL && - !check_hugepage_cache_consistency(vcpu, gfn, level)) - level = PT_DIRECTORY_LEVEL; + if (level > max_level) + level = max_level; gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); } -- cgit v1.2.3